However, determining the capacity limits of time-varying wireless channels with shadowing, multipath fading, and intersymbol interference is quite challenging, and A relatively simple lower bound for the capacity of any channel is the Shannon capacity under the worst-case propagation conditions. By continuing you agree to the Copyright © 2020 Elsevier B.V. or its licensors or contributors. Submit your e-mail address below. The communications channel to one's memories--one's past and one's very personality--is progressively degraded until every effort at error correction is overwhelmed and no meaningful signal can pass through. Shannon defined the quantity of information produced by a source--for example, the quantity in a message--by a formula similar to the equation that defines thermodynamic entropy in physics. This concept says that the more uncertainty in a communication channel, the more information that can be transmitted and vice versa. Claude Elwood Shannon, a mathematician born in Gaylord, Michigan (U.S.) in 1916, is credited with two important contributions to information technology: the application of Boolean theory to electronic switching, thus laying the groundwork for the digital computer, and developing the new field called information theory. Today everything from modems to music CDs rely on error-correction to function.
In the mid-1990s, Bennett, Smolin, Wootters, DiVincenzo, and others developed a quantitative theory of entanglement and introduced several techniques for faithful transmission of classical and quantum information through noisy channels; during the same period, Benjamin Schumacher, Richard Jozsa, Seth Lloyd, and others had major contributions to the study of noisy memoryless quantum channels.The cognitive radio architecture envisioned in the discussion in this chapter is shown in The acronym of the popular mobile phone standard GSM stands for Global System for Mobile Communications, or Groupe Spécial Mobile (its original name). Therefore, modern cryptography suffices with what is called computational security. This is generally considered sufficient.Information theory is the mathematical treatment of the concepts, parameters and rules governing the transmission of messages through communication systems. Claude Shannon died on February 24, 2001.A zero-day exploit is one that takes advantage of a security vulnerability on the same day that the vulnerability becomes generally known.Risk assessment is the identification of hazards that could negatively impact an organization's ability to conduct business.The Payment Card Industry Data Security Standard (PCI DSS) is a widely accepted set of policies and procedures intended to ...Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.PCI DSS 12 requirements is a set of security controls that businesses are required to implement to protect credit card data and ...The Federal Information Security Management Act (FISMA) is United States legislation that defines a comprehensive framework to ...A vulnerability assessment is the process of defining, identifying, classifying and prioritizing vulnerabilities in computer ...Telemedicine is the remote delivery of healthcare services, such as health assessments or consultations, over the ...Project Nightingale is a controversial partnership between Google and Ascension, the second largest health system in the United ...Medical practice management (MPM) software is a collection of computerized services used by healthcare professionals and ...Disaster recovery as a service (DRaaS) is the replication and hosting of physical or virtual servers by a third party to provide ...Cloud disaster recovery (cloud DR) is a combination of strategies and services intended to back up data, applications and other ...A crisis management plan (CMP) outlines how to respond to a critical situation that would negatively affect an organization's ...Hot plugging is the addition of a component to a running computer system without significant interruption to the operation of the...An M.2 SSD is a solid-state drive (SSD) that conforms to a computer industry specification and is used in internally mounted ...A kilobyte (KB or Kbyte) is a unit of measurement for computer memory or data storage used by mathematics and computer science ...No problem!
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